Wireless midfield systems and methods

A device comprising:

• an array of antennas, wherein the array of antennas can be mounted proximate a skin surface and to span a specified area of the skin surface when so mounted, such that each antenna of the array of antennas has a respective degree of electromagnetic coupling with an antenna of an implanted device that is implanted beneath the skin surface;
• and
• a controller operably coupled to the array of antennas, wherein the controller comprises a computing device programmed to perform operations comprising:
• determining a location, relative to the array of antennas, of the implanted device;
• selecting, based on the determined location of the implanted device, two or more antennas of the array of antennas;
• determining, based on the determined location of the implanted device, an amplitude and a relative phase for each of the selected two or more antennas;
• and
• operating the selected two or more antennas to provide electromagnetic energy to the implanted device, wherein operating the selected two or more antennas comprises emitting from each of the selected two or more antennas electromagnetic energy according to a corresponding determined amplitude and relative phase.

A method comprising:

• determining a location of an implanted device relative to an array of antennas in a reader device mounted to a skin surface, wherein the array of antennas spans a specified area of the skin surface, wherein the implanted device is implanted beneath the skin surface, and wherein each antenna of the array of antennas has a respective degree of electromagnetic coupling with an antenna of the implanted device;
• selecting, based on the determined location of the implanted device, two or more antennas of the array of antennas;
• determining, based on the determined location of the implanted device, an amplitude and a relative phase for each of the selected two or more antennas;
• and
• providing, via the selected two or more antennas, electromagnetic energy to the implanted device, wherein providing electromagnetic energy to the implanted device comprises emitting from each of the selected two or more antennas electromagnetic energy according to a corresponding determined amplitude and relative phase.

A device comprising:

• an array of excitable electromagnetic structures, wherein the array of excitable electromagnetic structures can be mounted proximate a skin surface and to span a specified area of the skin surface when so mounted, such that each structure of the array has a respective degree of electromagnetic coupling with an antenna of an implanted device that is implanted beneath the skin surface;
• and
• a controller operably coupled to the excitable electromagnetic structures, wherein the controller comprises a computing device programmed to perform operations comprising:
• determining a location, relative to the excitable electromagnetic structures, of the implanted device;
• determining, based on the determined location of the implanted device, an amplitude and a relative phase for each of at least two structures of the excitable electromagnetic structures;
• and
• operating the at least two structures of the excitable electromagnetic structures to provide electromagnetic energy to the implanted device, wherein operating the at least two structures comprises emitting from each of the at least two structures electromagnetic energy according to a corresponding determined amplitude and relative phase.